Humic acid enhances fertilizer efficiency and promotes crop fertility.

Improve fertilizer efficiency
The role of humic substances in improving fertilizer efficiency is mainly reflected in the following aspects:
nitrogen. Humic acid can significantly reduce the loss of nitrogen fertilizer, increase the utilization rate of nitrogen fertilizer, and have nitrification inhibition, prolonging the utilization time of plants.
phosphorus. Humic acid can inhibit the fixation of phosphorus in soil, increase the moving distance of phosphorus in soil, delay the conversion of available phosphorus to delayed or ineffective phosphorus, increase the utilization rate of phosphorus fertilizer and fertilizer efficiency, increase the phosphorus uptake of crops, and increase the amount of insoluble phosphorus. Dissolution.
Potassium. Humic acid can reduce the fixation of potassium in the soil, increase the potassium uptake of plants, and activate the potential potassium in the soil.
calcium. Calcium fulvic acid can greatly improve the activity of apple calcium pump, and its effect is higher than that of amino acid calcium. It is an excellent apple calcium supplement.
Trace elements. Humic acid also has synergistic and protective effects on trace elements in fertilizers.

Promote fertility
The role of humic substances in promoting fertility is mainly reflected in the following aspects:
Respiration. The redox property of humic acid itself can enhance the respiration rate of plants, provide energy for plant life activities, provide raw materials for the synthesis of important organic matter in plants, and improve the immunity of plants against disease.

Photosynthesis. It is inhibited by leaf proteolytic enzyme at a certain concentration, which is slow decomposition of chlorophyll and is beneficial to photosynthesis. However, if the concentration is too high, it will inhibit cell growth and decomposition.
nutrient. Humic acid increases cell membrane permeability by complexation, chelation or close adsorption with nutrients. Promote the absorption and functioning of nutrients.
Plant hormone. Some substances symbiotic with humic acid are hormones or hormones themselves, and can inhibit the activity of indoleacetal oxidase in plants, reduce the degradation of auxin in plants, and promote growth and development. However, if the concentration is too high, it will cause the activity of acetic acid oxidase, resulting in slow growth.
Root growth. Humic acid has the greatest influence on the growth of root cells, which can significantly increase the ribonucleic acid and cytokinin in the roots, especially the root hairs, stimulate the division of root cells and promote root growth.

Enhance stress resistance
The role of humic substances in enhancing stress resistance is mainly reflected in the following aspects:
Improve drought resistance. Spraying fulvic acid can stimulate the synthesis of proline and stimulate the activity of certain enzymes, maintain cell osmotic pressure, reduce cell membrane damage, reduce leaf stomatal opening and reduce transpiration intensity.
Improve cold resistance. Application of fulvic acid can significantly increase the content of protein and soluble sugar in vegetative organs and reduce cell membrane permeability in leaves.
Improve the ability to resist pests and diseases. The salicylic acid structure and phenolic structure in humic acid are inherently antibacterial, while humic acid can improve the metabolism of plants and increase the activity and immunity of certain enzymes.
Improve the ability to resist salt and alkali. Using humic acid to improve saline-alkali soil can effectively improve the soil conditions for fruit trees.

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